youve got blocks for a 1200 not a 120y
all 120ys have a big locating hole doover, if the bottom is too small then it is also likely that the top of the block is to small and wont actually locate in the diff

so you can enlarge the bottom hole to make the block fit the spring pack but i would check how it located in the diff first, if its too small id be returning it and getting the right ones

i think if you check vic raods, they are illegal full stop.

I feel for nick, most people come accross dodgey tradies now and then and have paid for work to be done. but if it was a cash job (as most would do to install these) and no reciept then there is no grounds for a complaint. also the trades place is not supposed to fit them in vic as they are NOT legal. especially if a roadworthy place as well.

No grounds for action here against the business, just dont go there again or get any one else to go there.

Hey Gino. Seems like you have the wrong blocks on your car. The installer was not savy enough to know that those have to sit flush . I do not think he did it on purpose, he did it because he is ignorant about the facts, and that is not the kind of person you want working on your car, at least not in the areas that particular mechanic knows nothing about.

Drive by and show him what is happening. Get the right set of blocks and have that guy re install those. He can not complain about the extra work, because he should had known better, and he should had told you the blocks did not fit your ride.

He is a dork of a mechanic , but at this point you want the job done , I do not think he would give you your money back, but he will ( and has to) re install theblocks the proper way. Get blocks at an autoparts shop ( sure you know a couple shops around ) and later on you can resell your current blocks.

Do not dispair, just take charge and do what it takes to remedy the situation. We all make mistakes, that is how we learn.